Chironomid larvae or bloodworm is a natural food that has the nutrients suitable for freshwater fish needs. Bloodworm utilization as fish feed in aquaculture is still limited, due to limited production. Huge floodplain waters are potential to be used as a place of bloodworm production. This study aimed to develop a technique producing bloodworm in floodplain waters which included searching suitable characteristics of sites and substrates for the production of bloodworm. Result of this study showed that the characteristics of the best location for the production of bloodworm were in the waters of the swamp forest covered tree canopy with water depth of 1 to 2 m. Type of a good substrate for the production of bloodworm was coconut fiber. The substrate was placed in a horizontal position at the bottom of hapa. Bloodworm production in this experiment was 0.938 g dry weight/m 2 or 32.83 g wet weight/m 2 .

Tropical floodplain rivers are home to the largest fraction of freshwater fish diversity and as such should be a focal point of fish conservation efforts. The aim of this study was to inventory of the fish fauna and analyzing the effect of seasonality on fish species composition and abundance in the Rungan river floodplain at Palangkaraya Municipality. The results of this study provide background data for conserving fish resources. Fishes were sampled at monthly intervals between May 2005 and April 2006 with gillnets of standardized dimensions with several mesh sizes. These were carried out at three stations with different habitat type, includes forested swamp, opened swamp, and river. A total of 4278 fishes were collected consisting of 50 species and 19 families. Seasonality effects on fish species composition and abundance in forested swamp and river. Fish species composition and abundance in opened swamp tend not to drive by seasonality.

Small-scale fish farmers have financial limitations to buy expensive commercial pellets to meet fish feed needs. Therefore, it is necessary to find alternative feeds that are cheap and able to support fish growth. Durian seeds (Durio Zibethinus) and Kelakai leaves (Stenochlaena palustris) are potential plant materials for additional fish feed which are abundant in Central Kalimantan Province. This study aims to determine whether additional feed formulations made from durian seed meal andelakai leaf meal can provide significant growth in tilapia (Oreochromis niloticus) rearing. The study used an experimental approach with a completely randomized design (CRD) with 3 treatments and 3 replications. The feed formulation is a mixture of pellets with 95% durian seed meal and 5% melakai leaf meal. Additional feeding is based on the following treatment: Treatment A, given commercial feed made by the factory brand MS prima Feed 1000 as much as 5% of the total weight of the fish kept, Treatment B: given formulated feed (90% pellets + 10% durian seed flour and kelakai leaf flour) as much as 5% of the total weight per day, Treatment C: given formulated feed (95% pellets + 5% mixture of durian seed flour and kelakai leaf flour) as much as 5% of the total fish weight per day. The results showed that the feeding of pellet formulations with durian seed flour and kelakai leaf flour as much as 10 % of body weight per day resulted in the highest growth in length and weight of fish.  Thus durian seed flour and Kelakai leaf flour can be used as additional feed for Nile tilapia to help increase fish growth and reduce fish feed costs.

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